diff --git a/.env.example b/.env.example
index 80771210..a45a6f66 100644
--- a/.env.example
+++ b/.env.example
@@ -3,6 +3,8 @@ NOTION_TOKEN=
 DATABASE_ID=
 PORT=3000
 
+ADMIN_EMAIL=
+
 CALENDAR_URL=
 
 GOOGLE_CLOUD_PROJECT=
diff --git a/__tests__/controllers/rsvpController.spec.ts b/__tests__/controllers/rsvpController.spec.ts
index 32b10872..1802422d 100644
--- a/__tests__/controllers/rsvpController.spec.ts
+++ b/__tests__/controllers/rsvpController.spec.ts
@@ -1,5 +1,5 @@
 import RsvpController from '../../src/controllers/rsvpController'
-import { beforeEach, describe, expect, it } from '@jest/globals'
+import { beforeEach, describe, expect, it, jest } from '@jest/globals'
 import { getMockReq, getMockRes } from '@jest-mock/express'
 import { Timestamp, addDoc } from 'firebase/firestore'
 import { FirebaseMock } from '../support/firebaseMock'
@@ -8,6 +8,8 @@ import FirestoreAdapter from '../../src/data/firestore/firestoreAdapter'
 const { res, mockClear } = getMockRes()
 
 beforeEach(() => {
+  process.env.ADMIN_EMAIL = 'admin@example.com'
+  jest.clearAllMocks()
   mockClear()
 })
 
@@ -55,6 +57,30 @@ describe('store', () => {
       )
     })
 
+    it('sends an email to admins', async () => {
+      const req = getMockReq({
+        params: { weekId: '2023-01-01' },
+        body: mockBody(),
+      })
+
+      await new RsvpController(firestoreAdapter).store(req, res)
+
+      expect(res.status).toHaveBeenCalledWith(201)
+      expect(addDoc).toHaveBeenCalledWith(
+        FirebaseMock.mockCollection('mail'),
+        {
+          to: 'admin@example.com',
+          message: {
+            subject: 'TNMC RSVP: test name',
+            // eslint-disable-next-line max-len
+            text: 'test name has RSVPed for 2023-01-01\n\nEmail: test@example.com\nPlus one: true',
+            // eslint-disable-next-line max-len
+            html: '<p>test name has RSVPed for 2023-01-01<p><ul><li>Email: test@example.com</li><li>Plus one: true</li></ul>',
+          },
+        }
+      )
+    })
+
     describe('when email is missing', () => {
       it('should return a 422', async () => {
         const req = getMockReq({
diff --git a/__tests__/data/firestore/firestoreAdapter.spec.ts b/__tests__/data/firestore/firestoreAdapter.spec.ts
index 8194c68c..e7986715 100644
--- a/__tests__/data/firestore/firestoreAdapter.spec.ts
+++ b/__tests__/data/firestore/firestoreAdapter.spec.ts
@@ -216,3 +216,25 @@ describe('createRsvp', () => {
     )
   })
 })
+
+describe ('sendEmail', () => {
+  it('sends an email', async () => {
+    await firestore.sendEmail('jsmith@example.com', {
+      subject: 'test subject',
+      text: 'test text',
+      html: 'test <p>html</p>',
+    })
+
+    expect(addDoc).toHaveBeenCalledWith(
+      FirebaseMock.mockCollection('mail'),
+      {
+        to: 'jsmith@example.com',
+        message: {
+          subject: 'test subject',
+          text: 'test text',
+          html: 'test <p>html</p>',
+        },
+      }
+    )
+  })
+})
diff --git a/src/config/mail.ts b/src/config/mail.ts
new file mode 100644
index 00000000..6825655c
--- /dev/null
+++ b/src/config/mail.ts
@@ -0,0 +1,9 @@
+export function adminEmail (): string {
+  const email = process.env.ADMIN_EMAIL
+
+  if (!email) {
+    throw new Error('ADMIN_EMAIL is not set')
+  }
+
+  return email
+}
diff --git a/src/controllers/rsvpController.ts b/src/controllers/rsvpController.ts
index 40a4defa..893a71ff 100644
--- a/src/controllers/rsvpController.ts
+++ b/src/controllers/rsvpController.ts
@@ -1,6 +1,7 @@
 import { type Request, type Response } from 'express'
 import FirestoreAdapter from '../data/firestore/firestoreAdapter'
 import { z } from 'zod'
+import { adminEmail } from '../config/mail'
 
 class RsvpController {
   static PATHS = {
@@ -28,6 +29,15 @@ class RsvpController {
     await this.firestore.createRsvp(weekId, name, email, plusOne)
 
     res.status(201).json({ message: 'Successfully RSVP\'d' })
+
+    await this.firestore.sendEmail(adminEmail(), {
+      subject: `TNMC RSVP: ${name}`,
+      // eslint-disable-next-line max-len
+      text: `${name} has RSVPed for ${weekId}\n\nEmail: ${email}\nPlus one: ${plusOne}`,
+      // eslint-disable-next-line max-len
+      html: `<p>${name} has RSVPed for ${weekId}<p><ul><li>Email: ${email}</li><li>Plus one: ${plusOne}</li></ul>`,
+    })
+
   }
 
   private validate (req: Request, res: Response): boolean {
diff --git a/src/data/firestore/firestoreAdapter.ts b/src/data/firestore/firestoreAdapter.ts
index 508d29bd..7fe37e7c 100644
--- a/src/data/firestore/firestoreAdapter.ts
+++ b/src/data/firestore/firestoreAdapter.ts
@@ -19,8 +19,9 @@ import Week from '../../models/week.js'
 import setupFirestore from '../../config/firestore.js'
 
 export default class FirestoreAdapter {
-  static readonly WEEKS_COLLECTION_NAME = 'weeks'
+  static readonly MAIL_COLLECTION_NAME = 'mail'
   static readonly RSVPS_COLLECTION_NAME = 'rsvps'
+  static readonly WEEKS_COLLECTION_NAME = 'weeks'
 
   #firestore: FirestoreType
 
@@ -88,6 +89,13 @@ export default class FirestoreAdapter {
     })
   }
 
+  async sendEmail (to: string, message: EmailMessage): Promise<void> {
+    await addDoc(this.mailCollection, {
+      to,
+      message,
+    })
+  }
+
   today (): Timestamp {
     const today = new Date()
     today.setHours(0, 0, 0, 0)
@@ -95,15 +103,23 @@ export default class FirestoreAdapter {
     return Timestamp.fromDate(today)
   }
 
-  private get weekCollection ():
-    CollectionReference<DocumentData,DocumentData>
-  {
-    return collection(this.#firestore, FirestoreAdapter.WEEKS_COLLECTION_NAME)
+  private get mailCollection (): Collection {
+    return collection(this.#firestore, FirestoreAdapter.MAIL_COLLECTION_NAME)
   }
 
-  private get rsvpCollection ():
-    CollectionReference<DocumentData,DocumentData>
-  {
+  private get rsvpCollection (): Collection {
     return collection(this.#firestore, FirestoreAdapter.RSVPS_COLLECTION_NAME)
   }
+
+  private get weekCollection (): Collection {
+    return collection(this.#firestore, FirestoreAdapter.WEEKS_COLLECTION_NAME)
+  }
 }
+
+export type EmailMessage = {
+  subject: string,
+  text: string,
+  html: string,
+}
+
+type Collection = CollectionReference<DocumentData,DocumentData>